STRUCT CCW_DRIVER(9)

🌸 struct ccw_driver(9) 🌸

okay so bestie, we're in the Kernel API Manual today and the star of the show is struct ccw_driver — literally the device driver for channel attached devices. yes, s390 content, yes it's iconic, stay with me 💅

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✨ NAME ✨

struct ccw_driver — device driver for channel attached devices 🎀

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🦋 SYNOPSIS 🦋

struct ccw_driver {
    struct ccw_device_id *ids;
    int (*probe) (struct ccw_device *);
    void (*remove) (struct ccw_device *);
    int (*set_online) (struct ccw_device *);
    int (*set_offline) (struct ccw_device *);
    int (*notify) (struct ccw_device *, int);
    void (*path_event) (struct ccw_device *, int *);
    void (*shutdown) (struct ccw_device *);
    enum uc_todo (*uc_handler) (struct ccw_device *, struct irb *);
    struct device_driver driver;
    enum interruption_class int_class;
 };

like, that's the whole struct, no notes, we love a clean layout 🫶

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💖 Members 💖

get comfy, we're doing a lil tour of every single field and honestly? obsessed.

• ids — the ids supported by this driver. it's giving guest list at the club 👑
• probe — function called on probe. first contact, bestie 😭
• remove — function called on remove. the goodbye arc, we hate to see it but it's necessary 💀
• set_online — called when setting device online. waking that device up ✨
• set_offline — called when setting device offline. nap time fr fr 🌸
• notify — notify driver of device state changes. it's literally the group chat ping 🦋
• path_event — notify driver of channel path events. main character energy for the paths 🎀
• shutdown — called at device shutdown. sad but iconic 🙈
• uc_handler — callback for unit check handler. the plot twist handler 🔥
• driver — embedded device driver structure. yes it's nested, no we don't make the rules 💅
• int_class — interruption class to use for accounting interrupts. keeping the books balanced, ngl ⭐

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🌈 SEE ALSO 🌈

• Kernel file ./arch/s390/include/asm/ccwdev.h struct ccw_device(9) — go read the sibling struct too, iykyk 💜

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real talk: every field above is a pointer/hook the kernel will call into, so keep the exact names and signatures — no renaming, no vibes-based edits 🫶

and that's the page, bestie! brought to you by the <rainbow>./arch/s390/include/asm` manual, October 2026 edition — ty for reading, mwah 💖🎀✨